Duplicating apparatus



March 5, 1935. HKASTRINER 1,993,611

DUPLICATING APPARATUS Filed Nov. 9, 1931 2 Sheets-Sheet 1 lNVENToR.

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March 5, 1935. KASTRWER 1,993,611

DUPLIGATING APPARATUS 2 Sheets-Sheet 2 Filed Nov. 9, 1931 L l l.[NVENTOR.

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Patented Mar. 5, 1935 f UNITED STATES DUPLICATING APPARATUS HenryKastl-incr, Cleveland, Ohio' Application November 9, 1931, Serial No.573,835

3` Claims.

` invention to provide an extremely simplined and efficient form ofstencil duplicating machine which possesses several featuresv of noveltyover lsuch machines which have been heretofore emploved for the samepurpose. Y

vllt is a further object to provide a feed roller for the sheet to beprinted which does not reu quire the presence of springs or similarauxiliary pressure means.

One Object of my invention is to provide a means for vintroducing anddischarging the stencilled sheets upon `the same side of the apparatusso that it. is not necessary for the operator to be subjected to theadditional effort of reaching from one side of the machine to the other.

'It is a further object to provide a device of relatively cheaprandsimple construction which may be operated by a person of average skillandintelligence. Y

Objects and advantages additional to those aboveenumerated shallbecomeapparent during the following description:

To the accomplishment of the foregoing and related ends, saidtinvention, then consists of the means hereinafter fully described andparticularly pointed out in the claims.-

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawings:

Fig. 1 is a top plan view of the apparatus embodying the principle of myinvention; Fig. 2 is a vertical section taken substantially upon line2-2 of Fig. 1; Fig. 3 is a side elevational view of Fig. 1 and Fig. 4 isa vertical section taken substantially upon line 4 4 of Fig. 1.

Referring more particularly to the drawings, the apparatus constructedin conformity to the principle of my invention possesses the rectangularbase portion 1 upon which are secured the vertical support frame members2 and 3. A rotatable stencil drum 4, such as customarily used in similarmachines is carried by the frame members at the bearing points 5 and 6.A crank arm 7, carrying the handle 8, is secured to one end of the shaftof the rotatable drum 4 (Cl. lOl- 118) by means of a'suitable wing nut9. The 'drum 4 has the central hollow shaft'lO in the interior of whichis inserted a smaller shaft. l1 to which,

in turn, is secured the smear brush 12.y A pair of long screw bolts 13and 14 threadably engage 5 with the, shaft 11 and are for the purpose ofadjusting' the position of the smear brush 12 in relation to theinterior of the drum 4. A handle l5 is secured to the outerV end of thesha-ft 11 in order to manipulate the smear 1o brush 12 around theinterior of the drum" 4 andto thoroughly distribute the inking mediumover the interior surface ofthe stencil.

A feeding tray 16 is removably suppo-rtedjat thev point 17 to the framemembers 2 and 3, l5 A supporting arm 18 further tendsto hold the feedingtray 16 in place upon the frame. The feeding tray may thus be removablyswung out of position in order to lfacilitate access to the stencildrum`4- when it isl found necessary to change stencils.' A pair ofadjustable guides 19 and 20 are positioned upon the upperfsurface of thefeeding tray 16 for the purpose of accommodating blank sheets of paperof various widths. f f

Y In Vorder Yto properly hold the sheet vto be printed against thesurface ofthe rotating sten--A cil, I provi-de a relatively heavy solidmetallic:

feed roller 21 having on each end the .journals 22'and 23 which areadapted to t into suitable slots at the top edge of the vertical framesupports 2 and 3.v For the purpose of facilitating the handling of thefeed roller 21, the knurled knob 24 may be provided on the end of thejournal 23. For the purpose of returning the printed sheets to the sameside ofthe machine as that from which they were initially introduced, Iprovide theV passage-way or chute 25 having the arcuate inner and outerWalls 26 and 27 respectively. The curved outer wall 27 is integral withthe angularly inclined straight portion 28, so that the printed sheetswill be guided into the removable receiving tray 29.

For the purpose of imparting an intermittent stopping motion to therotation of the stencil drum, the spring-loaded plunger 30 on the end ofthe crank handle 8 is adapted to engage with the arcuate groove 31 inthe spring bracket 32. As shown in Fig. 2, the arcuate groove 31 has adeeper hemispherical cavity 33 for the reception of the spring-loadedplunger 30, so that the last described mechanism shall possess a detentaction for the purpose of 'temporarily stopping the rotation of the drum4 on each revolution.V

It will thus be seen that when a blank sheet 55 of paper is placed inthe feeding tray 16 and engaged by the stencil drum 4 and feed roller21, that it is carried around the passage-way 25 and discharged into thereceiving tray 29 with the printed surface uppermost. Accordingly, it ispossible for the operator to have a full and complete view of each sheetimmediately after it is printed. Furthermore, there are no complicatedlevers, springs or adjusting mechanisms which require the attention of askilled operator.

It should be further noted that the crank handle connection 34 of thecrank arm 7 to the drum shaft 5 is made serrated and adjustable in orderthat the starting position of the drum 4 may be made variable inrelation to the starting position of the crank handle. The advantage ofthe last described feature resides in the fact that when the stencilbecomes shortened because of cutting, tearing, or otherwise damaged andhence must undergo a relative change of position on the drum, it ismerely necessary to change the starting position of the drum so that theposition of the stenciled or printed matter on the paper sheet will beproperly compensated for and placed.

It will thus be seen that the construction of the device embodying theprinciple ofv my invention possesses lthe further advantages in that therotating drum is substantially completely enclosed, preventing catchingand entanglement of the operators clothing; and that the entire assemblyoccupies a relatively small space 'as compared to the structures of theprior art.

Other modes of applying the principle of my invention may be employedinsteadof the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a stencil duplicating apparatus, the' combination of a rotatablestencil drum, a stencil printing sheet carried by said drum, a sheetfeeding tray positioned adjacent the upper circumference of said drumand having its inner end located substantially adjacent the verticaldiameter of said drum, and a sheet receiving tray positioned below saidfeeding tray having its outer end extending beyond the outer end of saidfeeding tray, and the inner end of said receiving tray being disposedbelow the bottom circumference of said drum and beyond a vertical linecoincident With the periphery of said drum, whereby the interior of saidreceiving tray is accessible and visible by an operator from the sameside of the apparatus as that on which said feeding tray is positioned.

' 2. In a stencil duplicating'apparatus, the combination of a rotatablestencil-drum, a "stencil printing sheet carried by said drum, aremovable sheet feeding tray positioned adjacent the upper circumferenceof said drum and having its inner end located substantially adjacent thevertical diameter of said drum, and a removable sheet receiving traypositioned below said feeding tray having its cuter end extending beyondthe outer end of said feeding tray, and the inner end of said receivingtray being disposed below thebottom circumference of said drum andbeyond a vertical line coincident with the periphery of said drum,whereby the interior of said receiving tray is accessible and visible byan operator from the same side of the apparatus as that on which saidfeeding tray is positioned.

3. In a stencil duplicating apparatus,` the cornbination of a rotatablestencil drum, a stencil printing sheet carried by said drum, a removablesheet feeding tray positioned adjacent the upper circumference of said'4drum 'and having its inner end located substantially adjacent thevertical diameter of said drum, and a removable sheet receiving traypositioned below said feeding tray having its outer end extending beyondthe outer end of said 1feeding tray, and the inner end of said receivingtray being disposed below the bottom circumference of said drum andbeyond a vertical line coincident With the periphery of said drum,whereby the interior of said receiving tray is accessible and visible byan operator from'the same side of the apparatus as that on which saidfeeding tray is positioned, and a conveying chute leading from the sideof said drum opposite to that of said feeding tray to the inner end ofsaid receiving tray for directing the printed sheets from saidy drum tosaid receiving tray.

HENRY KASTRINER.

